A Famine wall is a stone wall about the height of a man (in Ireland). They were built during the Famine of the 1840s as a means to keep the hungry masses out of the estates of the landowners. Ironically, it was the (usually homeless) Catholics who built the walls, for a few scraps to eat. Massive work projects like the Famine walls and the Famine roads kept the masses barely alive during the four years that the crops failed.
In modern usage, a céilidh or ceilidh is a traditional Gaelic social gathering, which usually involves playing Gaelic folk music and dancing. It originated in Ireland and Scotland, but is now common throughout the Irish and Scottish diasporas. In Scottish Gaelic it is spelt cèilidh and in Irish it is spelt céilí.